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Steel Making

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

The material used for all gears on the Liberty engine was sel...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Critical Points
One of the most important means of investigating the properti...

Chromium when alloyed with steel, has the characteristic func...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Although it is possible to work steels cold, to an extent de...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

An Automatic Temperature Control Pyrometer


Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.

Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer

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